Sealless rheometer die assembly

摘要

A sealless die assembly with a backing element is disclosed. A first die assembly cooperates with a second die assembly to form a sample-holding chamber. At least one of the die assemblies includes a die and a housing that are separated from one another by a radial gap such that the die is rotatable relative to its housing. A thin film is positioned to bridge the gap between the die and its housing to maintain pressure in the sample-holding chamber. A backing element cooperates with the die housing to interface with the film, and the backing element is spaced from its corresponding die. The backing element helps to transfer torque from the sample to the torque transducer. The die assembly may be incorporated into a rheometer or other sampling measuring apparatus for testing process characteristics of a material.

主权项

1. A rheometer for measuring properties of a sample material, comprising:
a first die assembly comprising a first die and a first sealing plate; a gap between the first die and the first sealing plate; a second die assembly comprising a second die and a second sealing plate, the first and second dies forming a sample-holding chamber; and a backing element cooperating with the first sealing plate, wherein a portion of the backing element interfaces with the sample-holding chamber, wherein: the first and second die assemblies are arranged to accept a film to be positioned between the first and second dies to bridge the gap between the first die and the first sealing plate, and when the film is held between the dies, the backing element is spaced from the first die with the film separating the backing element from the sample-holding chamber.